No problem, we've got 1918 and 3999 to multiply
1918 × 3999 = 3999 × (1918)
+ 3999 × 8 that is equal 31992
+ 3999 × 10 resulting in 39990
+ 3999 × 900 that equals 3599100
+ 3999 × 1000 which equals 3999000

= 7670082
